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日期: 2020-01-02 07:50 浏览次数 : 59

centos 磁盘分区扩容

操作步骤如下:

第一步、查看本机现有分区情况
[[email protected] ~]# df -h
文件系统容量已用可用已用%% 挂载点
/dev/mapper/VolGroup-lv_root
7.7G 7.1G 155M 98% /
tmpfs 3.9G 296K 3.9G 1% /dev/shm
/dev/sda1 485M 64M 396M 14% /boot
/dev/sda3 83G 350M 79G 1% /media
第二步、查看本机的磁盘情况
[[email protected] ~]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x000dc0ad

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 2089 16264192 8e Linux LVM
/dev/sda3 2090 13054 88076362+ 83 Linux

Disk /dev/mapper/VolGroup-lv_root: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_swap: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000
注意:此时还没有在EXSI5.0中添加第二块硬盘
[[email protected] ~]#
第三步、添加第二块硬盘

查看此时系统磁盘情况
[email protected] ~]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x000dc0ad

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinderboundary.
/dev/sda2 64 2089 16264192 8e Linux LVM
/dev/sda3 2090 13054 88076362+ 83 Linux

Disk /dev/sdb: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_root: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_swap: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

可以看到我们新添加的硬盘sdb

[[email protected] ~]#
第四步、对第二块硬盘sdb进行分区

[[email protected] ~]# fdisk /dev/sdb
Device contains neither a valid DOSpartition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with diskidentifier 0xfa4abbdc.
Changes will remain in memory only, untilyou decide to write them.
After that, of course, the previous contentwon't be recoverable.

Warning: invalid flag 0x0000 of partitiontable 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated.It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').

Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibilityflag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOSpartition table
p print the partition table
q quit without saving changes
s create a new empty Sundisklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (expertsonly)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 4
First cylinder (1-2088, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G}(1-2088, default 2088):
Using default value 2088

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

说明:上面操作对sdb硬盘进行了分区操作,设为sdb4分区了(当然上面建立的主分区可以为1-4中的任意一个,我这里选择的4)。

第五步、对新建立的sdb4分区进行格式

[[email protected] ~]# mkfs.ext4 /dev/sdb4
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1048576 inodes, 4192957 blocks
209647 blocks (5.00%) reserved for thesuper user
第一个数据块=0
必赢手机登录网址 ,Maximum filesystem blocks=4294967296
128 block groups
32768 blocks per group, 32768 fragments pergroup
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000

正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystemaccounting information: done完成

This filesystem will be automaticallychecked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

说明:将sdb4分区格式化为ext4格式,因为CentOS安装是系统的格式ext4,所以这里要注意一下。

第六步、格式后的sdb4分区添加为物理卷
[[email protected] ~]# pvcreate /dev/sdb4
Physical volume "/dev/sdb4" successfully created

第七步、查看当前系统的物理卷(PV)情况

[[email protected] ~]# pvdisplay
---Physical volume ---
PVName /dev/sda2
VGName VolGroup
PVSize 15.51 GiB / not usable3.00 MiB
Allocatable yes (butfull)
PESize 4.00 MiB
Total PE 3970
Free PE 0
Allocated PE 3970
PVUUID Up77sG-sNKf-Ja0k-crBf-N0wz-a5hy-T6sVFh

"/dev/sdb4" is a new physical volume of "15.99 GiB"
---NEW Physical volume ---
PVName /dev/sdb4
VGName
PVSize 15.99 GiB
Allocatable NO
PESize 0
Total PE 0
Free PE 0
Allocated PE 0
PVUUID Gqnw7N-HooX-S2Nz-1NIZ-YpOe-g0jo-grG1rQ
说明:可以看到添加的新物理卷sdb4,大小都符合我们添加时的设置

第八步、查看当前卷组情况
[[email protected] ~]# vgdisplay
---Volume group ---
VGName VolGroup
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VGAccess read/write
VGStatus resizable
MAXLV 0
CurLV 2
Open LV 2
MaxPV 0
CurPV 1
ActPV 1
VGSize 15.51 GiB
PESize 4.00 MiB
Total PE 3970
Alloc PE / Size 3970 / 15.51GiB
Free PE / Size 0 / 0
VGUUID PPrifh-glzl-nnxX-YkBm-xJ1s-rgnw-d1WsJd

第九步、将分区sdb4转换为扩展分区

[[email protected] ~]# vgextend VolGroup/dev/sdb4
Volume group "VolGroup" successfully extended

第十步、查看当前的逻辑卷

[[email protected] ~]# lvdisplay
---Logical volume ---
LVPath /dev/VolGroup/lv_root
LVName lv_root
VGName VolGroup
LVUUID dCIsej-0NWX-bVFe-bT6L-c4eY-oy4G-9lNBOC
LVWrite Access read/write
LVCreation host, time ,
LVStatus available
#open 1
LVSize 7.75 GiB
Current LE 1985
Segments 1
Allocation inherit
Read ahead sectors auto
-currently set to 256
Block device 253:0

---Logical volume ---
LVPath /dev/VolGroup/lv_swap
LVName lv_swap
VGName VolGroup
LVUUID K5bxJo-2SmM-6NCU-mBJP-Qzp1-ZODH-nbLK0k
LVWrite Access read/write
LVCreation host, time ,
LVStatus available
#open 1
LVSize 7.75 GiB
Current LE 1985
Segments 1
Allocation inherit
Read ahead sectors auto
-currently set to 256
Block device 253:1

说明:这里可以看到“/”根分区的路径名称为:/dev/VolGroup/lv_root

第十一步、查看扩展后的卷组情况
[[email protected] ~]# vgdisplay
---Volume group ---
VGName VolGroup
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VGAccess read/write
VGStatus resizable
MAXLV 0
CurLV 2
Open LV 2
MaxPV 0
CurPV 2
ActPV 2
VGSize 31.50 GiB
PESize 4.00 MiB
Total PE 8064
Alloc PE / Size 3970 / 15.51GiB
Free PE / Size 4094 / 15.99 GiB
VGUUID PPrifh-glzl-nnxX-YkBm-xJ1s-rgnw-d1WsJd
说明:扩展后的卷子情况,可以看出大小增加了16GB(与第八步中的对比)

第十二步、将新增的逻辑卷全部扩展到“/”分区中

[[email protected] ~]# lvextend -L +15.99G/dev/VolGroup/lv_root
Rounding size to boundary between physical extents: 15.99 GiB
Extending logical volume lv_root to 23.75 GiB
Logical volume lv_root successfully resized

说明:这里sdb4总共有16G,所以把16BG全部添加给根分区。

第十三步、查看“/”根分区格式,并重新刷新根分区的大小
[[email protected] ~]# e2fsck -f/dev/VolGroup/lv_root
e2fsck 1.41.12 (17-May-2010)
/dev/VolGroup/lv_root is mounted.
e2fsck: 无法继续, 中止.

[[email protected] ~]# resize2fs(或者xfs_growfs) /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root ismounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of/dev/VolGroup/lv_root to 6224896 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root isnow 6224896 blocks long.
说明:命令resize2fs即刷新根分区“/dev/VolGroup/lv_root”的容量。

第十三步、查看刷新后根分区的大小

[[email protected] ~]# df -h
文件系统容量已用可用已用%% 挂载点
/dev/mapper/VolGroup-lv_root
24G 7.1G 16G 32% /
tmpfs 3.9G 144K 3.9G 1% /dev/shm
/dev/sda3 83G 350M 79G 1% /media/Lucene

说明:可以看到根分区的大小有7.7G变成了24G,重启一下系统再来看情况。此时就可以继续安装软件了,不会提示空间不足了。

磁盘分区扩容 操作步骤如下: 第一步、查看本机现有分区情况 [[email protected] ~]# df -h 文件系统容量已用可用已用%% 挂载点 /dev/mapper/Vol...

centos根分区扩容

操作环境:
[[email protected] ~]# uname -a
Linux linuxidc 2.6.32-358.18.1.el6.x86_64#1 SMP Wed Aug 28 17:19:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
现状分析:
系统有两个硬盘,第一个硬盘107G,“/”分区空间当时分区时只给了7.7G过小,空间马上占完。现在系统有第二个硬盘sdb大小为16GB,希望把sdb的所有空间加入到“/”分区中,是其空间容量从7.7GB变成7.7GB+16GB(约2.4GB)。(当然如果这里只有一个硬盘sda,有很多空间尚未使用可以进行同样的操作)
操作步骤如下:
第一步、查看本机现有分区情况
[[email protected] ~]# df -h
文件系统容量已用可用已用%% 挂载点
/dev/mapper/VolGroup-lv_root
7.7G 7.1G 155M 98% /
tmpfs 3.9G 296K 3.9G 1% /dev/shm
/dev/sda1 485M 64M 396M 14% /boot
/dev/sda3 83G 350M 79G 1% /media
第二步、查看本机的磁盘情况
[[email protected] ~]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x000dc0ad

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 2089 16264192 8e Linux LVM
/dev/sda3 2090 13054 88076362+ 83 Linux

Disk /dev/mapper/VolGroup-lv_root: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_swap: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000
注意:此时还没有在EXSI5.0中添加第二块硬盘
[[email protected] ~]#
第三步、添加第二块硬盘

查看此时系统磁盘情况
[email protected] ~]# fdisk -l

Disk /dev/sda: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x000dc0ad

Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinderboundary.
/dev/sda2 64 2089 16264192 8e Linux LVM
/dev/sda3 2090 13054 88076362+ 83 Linux

Disk /dev/sdb: 17.2 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_root: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

Disk /dev/mapper/VolGroup-lv_swap: 8325 MB,8325693440 bytes
255 heads, 63 sectors/track, 1012 cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Sector size (logical/physical): 512 bytes /512 bytes
I/O size (minimum/optimal): 512 bytes / 512bytes
Disk identifier: 0x00000000

可以看到我们新添加的硬盘sdb

[[email protected] ~]#
第四步、对第二块硬盘sdb进行分区

[[email protected] ~]# fdisk /dev/sdb
Device contains neither a valid DOSpartition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with diskidentifier 0xfa4abbdc.
Changes will remain in memory only, untilyou decide to write them.
After that, of course, the previous contentwon't be recoverable.

Warning: invalid flag 0x0000 of partitiontable 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated.It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').

Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibilityflag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOSpartition table
p print the partition table
q quit without saving changes
s create a new empty Sundisklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (expertsonly)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 4
First cylinder (1-2088, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G}(1-2088, default 2088):
Using default value 2088

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

说明:上面操作对sdb硬盘进行了分区操作,设为sdb4分区了(当然上面建立的主分区可以为1-4中的任意一个,我这里选择的4)。

第五步、对新建立的sdb4分区进行格式

[[email protected] ~]# mkfs.ext4 /dev/sdb4
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
1048576 inodes, 4192957 blocks
209647 blocks (5.00%) reserved for thesuper user
第一个数据块=0
Maximum filesystem blocks=4294967296
128 block groups
32768 blocks per group, 32768 fragments pergroup
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000

正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystemaccounting information: done完成

This filesystem will be automaticallychecked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

说明:将sdb4分区格式化为ext4格式,因为CentOS安装是系统的格式ext4,所以这里要注意一下。

第六步、格式后的sdb4分区添加为物理卷
[[email protected] ~]# pvcreate /dev/sdb4
Physical volume "/dev/sdb4" successfully created

第七步、查看当前系统的物理卷(PV)情况

[[email protected] ~]# pvdisplay
---Physical volume ---
PVName /dev/sda2
VGName VolGroup
PVSize 15.51 GiB / not usable3.00 MiB
Allocatable yes (butfull)
PESize 4.00 MiB
Total PE 3970
Free PE 0
Allocated PE 3970
PVUUID Up77sG-sNKf-Ja0k-crBf-N0wz-a5hy-T6sVFh

"/dev/sdb4" is a new physical volume of "15.99 GiB"
---NEW Physical volume ---
PVName /dev/sdb4
VGName
PVSize 15.99 GiB
Allocatable NO
PESize 0
Total PE 0
Free PE 0
Allocated PE 0
PVUUID Gqnw7N-HooX-S2Nz-1NIZ-YpOe-g0jo-grG1rQ
说明:可以看到添加的新物理卷sdb4,大小都符合我们添加时的设置

第八步、查看当前卷组情况
[[email protected] ~]# vgdisplay
---Volume group ---
VGName VolGroup
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
VGAccess read/write
VGStatus resizable
MAXLV 0
CurLV 2
Open LV 2
MaxPV 0
CurPV 1
ActPV 1
VGSize 15.51 GiB
PESize 4.00 MiB
Total PE 3970
Alloc PE / Size 3970 / 15.51GiB
Free PE / Size 0 / 0
VGUUID PPrifh-glzl-nnxX-YkBm-xJ1s-rgnw-d1WsJd

第九步、将分区sdb4转换为扩展分区

[[email protected] ~]# vgextend VolGroup/dev/sdb4
Volume group "VolGroup" successfully extended

第十步、查看当前的逻辑卷

[[email protected] ~]# lvdisplay
---Logical volume ---
LVPath /dev/VolGroup/lv_root
LVName lv_root
VGName VolGroup
LVUUID dCIsej-0NWX-bVFe-bT6L-c4eY-oy4G-9lNBOC
LVWrite Access read/write
LVCreation host, time ,
LVStatus available
#open 1
LVSize 7.75 GiB
Current LE 1985
Segments 1
Allocation inherit
Read ahead sectors auto
-currently set to 256
Block device 253:0

---Logical volume ---
LVPath /dev/VolGroup/lv_swap
LVName lv_swap
VGName VolGroup
LVUUID K5bxJo-2SmM-6NCU-mBJP-Qzp1-ZODH-nbLK0k
LVWrite Access read/write
LVCreation host, time ,
LVStatus available
#open 1
LVSize 7.75 GiB
Current LE 1985
Segments 1
Allocation inherit
Read ahead sectors auto
-currently set to 256
Block device 253:1

说明:这里可以看到“/”根分区的路径名称为:/dev/VolGroup/lv_root

第十一步、查看扩展后的卷组情况
[[email protected] ~]# vgdisplay
---Volume group ---
VGName VolGroup
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VGAccess read/write
VGStatus resizable
MAXLV 0
CurLV 2
Open LV 2
MaxPV 0
CurPV 2
ActPV 2
VGSize 31.50 GiB
PESize 4.00 MiB
Total PE 8064
Alloc PE / Size 3970 / 15.51GiB
Free PE / Size 4094 / 15.99 GiB
VGUUID PPrifh-glzl-nnxX-YkBm-xJ1s-rgnw-d1WsJd
说明:扩展后的卷子情况,可以看出大小增加了16GB(与第八步中的对比)

第十二步、将新增的逻辑卷全部扩展到“/”分区中

[[email protected] ~]# lvextend -L +15.99G/dev/VolGroup/lv_root
Rounding size to boundary between physical extents: 15.99 GiB
Extending logical volume lv_root to 23.75 GiB
Logical volume lv_root successfully resized

说明:这里sdb4总共有16G,所以把16BG全部添加给根分区。

第十三步、查看“/”根分区格式,并重新刷新根分区的大小
[[email protected] ~]# e2fsck -f/dev/VolGroup/lv_root
e2fsck 1.41.12 (17-May-2010)
/dev/VolGroup/lv_root is mounted.
e2fsck: 无法继续, 中止.

[[email protected] ~]# resize2fs /dev/VolGroup/lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/VolGroup/lv_root ismounted on /; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 2
Performing an on-line resize of/dev/VolGroup/lv_root to 6224896 (4k) blocks.
The filesystem on /dev/VolGroup/lv_root isnow 6224896 blocks long.
说明:命令resize2fs即刷新根分区“/dev/VolGroup/lv_root”的容量。

第十三步、查看刷新后根分区的大小

[[email protected] ~]# df -h
文件系统容量已用可用已用%% 挂载点
/dev/mapper/VolGroup-lv_root
24G 7.1G 16G 32% /
tmpfs 3.9G 144K 3.9G 1% /dev/shm
/dev/sda3 83G 350M 79G 1% /media/Lucene

说明:可以看到根分区的大小有7.7G变成了24G,重启一下系统再来看情况。此时就可以继续安装软件了,不会提示空间不足了。

操作环境: [[email protected] ~]# uname -a Linux linuxidc 2.6.32-358.18.1.el6.x86_64#1 SMP Wed Aug 28 17:19:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux 现状分...

操作步骤简述:
1.查看磁盘信息

2.给硬盘/dev/sdc添加分区/dev/sdc1

2.1.fdisk /dev/sdc

m 查看帮助

n 添加新分区

t 修改分区类型为:8e  Linux LVM

p 查看分区

w 写入分区表并退出

q 不保存分区表并退出

 

3.扩展逻辑卷/dev/mapper/vg_RedHat-lv_root的大小

3.1进入LVM管理器

3.2将物理卷添加到现有卷组(也可直接将分区添加到现有卷组)

3.3查看所有逻辑卷

3.4扩展逻辑卷大小

 

实际操作过程:

[root@TEST ~]# df -hl

Filesystem                Size  Used Avail Use% Mounted on

/dev/mapper/vg_redhat-lv_root  45G  36G  6.7G  85% /

tmpfs                  7.8G  3.8G  4.1G  48% /dev/shm

/dev/sda1            485M  39M  421M  9% /boot

 

[root@TEST ~]# fdisk -l

Disk /dev/sda: 53.7 GB, 53687091200 bytes

64 heads, 32 sectors/track, 51200 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000af440

 

  Device Boot      Start        End      Blocks  Id  System
/dev/sda1  *          2        501      512000  83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2            502      51200    51915776  8e  Linux LVM
Partition 2 does not end on cylinder boundary.

 

Disk /dev/sdb: 17.2 GB, 17179869184 bytes

64 heads, 32 sectors/track, 16384 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

 

 

Disk /dev/sdc: 42.9 GB, 42949672960 bytes

64 heads, 32 sectors/track, 40960 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

 

 

Disk /dev/mapper/vg_redhat-lv_root: 49.0 GB, 48997859328 bytes

255 heads, 63 sectors/track, 5956 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

 

 

Disk /dev/mapper/vg_redhat-lv_swap: 4160 MB, 4160749568 bytes

255 heads, 63 sectors/track, 505 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

[root@TEST ~]# fdisk /dev/sdc

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0x93ae6d58.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

 

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

 

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

        switch off the mode (command 'c') and change display units to

        sectors (command 'u').

 

Command (m for help): n

Command action

  e  extended

  p  primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-40960, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-40960, default 40960): +40G

Value out of range.

Last cylinder, +cylinders or +size{K,M,G} (1-40960, default 40960): +39G

 

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): L

 

 0  Empty          24  NEC DOS        81  Minix / old Lin bf  Solaris       

 1  FAT12          39  Plan 9          82  Linux swap / So c1  DRDOS/sec (FAT-

 2  XENIX root      3c  PartitionMagic  83  Linux          c4  DRDOS/sec (FAT-

 3  XENIX usr      40  Venix 80286    84  OS/2 hidden C:  c6  DRDOS/sec (FAT-

 4  FAT16 <32M      41  PPC PReP Boot  85  Linux extended  c7  Syrinx         

 5  Extended        42  SFS            86  NTFS volume set da  Non-FS data   

 6  FAT16          4d  QNX4.x          87  NTFS volume set db  CP/M / CTOS / .

 7  HPFS/NTFS      4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility   

 8  AIX            4f  QNX4.x 3rd part 8e  Linux LVM      df  BootIt         

 9  AIX bootable    50  OnTrack DM      93  Amoeba          e1  DOS access     

 a  OS/2 Boot Manag 51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O       

 b  W95 FAT32      52  CP/M            9f  BSD/OS          e4  SpeedStor     

 c  W95 FAT32 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs       

 e  W95 FAT16 (LBA) 54  OnTrackDM6      a5  FreeBSD        ee  GPT           

 f  W95 Ext'd (LBA) 55  EZ-Drive        a6  OpenBSD        ef  EFI (FAT-12/16/

10  OPUS            56  Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b

11  Hidden FAT12    5c  Priam Edisk    a8  Darwin UFS      f1  SpeedStor     

12  Compaq diagnost 61  SpeedStor      a9  NetBSD          f4  SpeedStor     

14  Hidden FAT16 <3 63  GNU HURD or Sys ab  Darwin boot    f2  DOS secondary 

16  Hidden FAT16    64  Novell Netware  af  HFS / HFS+      fb  VMware VMFS   

17  Hidden HPFS/NTF 65  Novell Netware  b7  BSDI fs        fc  VMware VMKCORE

18  AST SmartSleep  70  DiskSecure Mult b8  BSDI swap      fd  Linux raid auto

1b  Hidden W95 FAT3 75  PC/IX          bb  Boot Wizard hid fe  LANstep       

1c  Hidden W95 FAT3 80  Old Minix      be  Solaris boot    ff  BBT           

1e  Hidden W95 FAT1

Hex code (type L to list codes): 8e

Changed system type of partition 1 to 8e (Linux LVM)

 

Command (m for help): p

 

Disk /dev/sdc: 42.9 GB, 42949672960 bytes

64 heads, 32 sectors/track, 40960 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x93ae6d58

 

  Device Boot      Start        End      Blocks  Id  System

/dev/sdc1              1      39937    40895472  8e  Linux LVM

 

Command (m for help): w

The partition table has been altered!

 

Calling ioctl() to re-read partition table.

Syncing disks.

 

[root@TEST ~]# fdisk -l

 

Disk /dev/sda: 53.7 GB, 53687091200 bytes

64 heads, 32 sectors/track, 51200 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000af440

 

  Device Boot      Start        End      Blocks  Id  System

/dev/sda1  *          2        501      512000  83  Linux

Partition 1 does not end on cylinder boundary.

/dev/sda2            502      51200    51915776  8e  Linux LVM

Partition 2 does not end on cylinder boundary.

 

Disk /dev/sdb: 17.2 GB, 17179869184 bytes

64 heads, 32 sectors/track, 16384 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

 

 

Disk /dev/sdc: 42.9 GB, 42949672960 bytes

64 heads, 32 sectors/track, 40960 cylinders

Units = cylinders of 2048 * 512 = 1048576 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x93ae6d58

 

  Device Boot      Start        End      Blocks  Id  System

/dev/sdc1              1      39937    40895472  8e  Linux LVM

 

Disk /dev/mapper/vg_redhat-lv_root: 49.0 GB, 48997859328 bytes

255 heads, 63 sectors/track, 5956 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

 

 

Disk /dev/mapper/vg_redhat-lv_swap: 4160 MB, 4160749568 bytes

255 heads, 63 sectors/track, 505 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

 

 

 

 

[root@TEST ~]# lvm

lvm> pvcreate /dev/sdc1

  Physical volume "/dev/sdc1" successfully created

lvm> pvremove /dev/sdc1

  Labels on physical volume "/dev/sdc1" successfully wiped

lvm> vgextend vg_redhat /dev/sdc1    【不知道vg名字可以在root下执行vgdisplay查看】

  No physical volume label read from /dev/sdc1

  Physical volume /dev/sdc1 not found

  Physical volume "/dev/sdc1" successfully created

  Volume group "vg_redhat" successfully extended

lvm> lvextend -L +39G /dev/mapper/vg_redhat-lv_root

  Extending logical volume lv_root to 84.63 GiB

  Insufficient free space: 9984 extents needed, but only 9983 available

lvm> lvextend -L +38.99G /dev/mapper/vg_redhat-lv_root

 

  Rounding size to boundary between physical extents: 38.99 GiB

  Extending logical volume lv_root to 84.62 GiB

  Logical volume lv_root successfully resized

lvm> pvdisplay

  --- Physical volume ---

  PV Name              /dev/sda2

  VG Name              vg_redhat

  PV Size              49.51 GiB / not usable 3.00 MiB

  Allocatable          yes (but full)

  PE Size              4.00 MiB

  Total PE              12674

  Free PE              0

  Allocated PE          12674

  PV UUID              ILOutm-u1Gf-chRB-rhn4-RGVg-hcEb-mN02Fm

 

  --- Physical volume ---

  PV Name              /dev/sdc1

  VG Name              vg_redhat

  PV Size              39.00 GiB / not usable 4.98 MiB

  Allocatable          yes

  PE Size              4.00 MiB

  Total PE              9983

  Free PE              9983

  Allocated PE          0

  PV UUID              nrqQ7M-PCVI-cDAy-ufew-WYYv-8HPF-dRyraa

 

lvm> quit

  Exiting.

 

[root@TEST ~]# resize2fs /dev/mapper/vg_redhat-lv_root

resize2fs 1.41.12 (17-May-2010)

Filesystem at /dev/mapper/vg_redhat-lv_root is mounted on /; on-line resizing required

old desc_blocks = 3, new_desc_blocks = 6

Performing an on-line resize of /dev/mapper/vg_redhat-lv_root to 22183936 (4k) blocks.

The filesystem on /dev/mapper/vg_redhat-lv_root is now 22183936 blocks long.

这时,可以手工计算一下多了多少空间。
现在的大小为22183936 blocks,即22183936*4*1024bytes,拓展之前大小可以在fdisk -l命令下看到,为48997859328 bytes,由此可以计算增加的大小为:
(22183936*4*1024-48997859328)/1024^3=38.99G

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